A device consisting of 4 interlocked hollow cylinders, arranged with a central one and the three others equidistant around it. Each cylinder has three fixed tabs protruding from their sides to about halfway to center, while some manner of articulated business occupies the spaces between tabs and the center. When lifted, the articulated tabs tilt.
Most of the video is of different groups of colored marbles being placed in the device, which is then lifted repeatedly to make the active bits push them along, one tab width at a time, making loops of the device.